Integrates Java objects, XML documents, SQL relational databases and LDAP directories in a unified model that allows information to be exchanged, persisted and manipulated in a variety of ways. Supports JDO. [Open Source, BSD-like]

A home page for JSR-000012, Java Data Objects.

JDO implementation using JDBC. A fork of TJDO with application identity, support for existing schemas, and conformance for J2EE. [Open source, Apache 2 license]

Implementation of Sun's JDO specification (JSR 12), designed to support transparent persistence using any JDBC-compliant database. [Open source, Apache Software License]

An implementation of the Java Data Objects standard (JDO). Includes many additional features and development tools. [Commercial]

Provides interface-based persistence to RDBMSs while allowing developers to focus on the object model, not the physical layer. It implements many of the interfaces specified by JDO. [Open source, GPL]

Jacek Kruszelnicki discusses the issues encountered with persistence, presents traits for an ideal persistence layer, and reviews available JDO solutions.

The Proposed Final Draft of the JDO 1.1 specification for object-relational mapping on the Java platform.

Starting with an introduction to JDO, it provides detailed code samples of developing applications with JDO. Articles and tutorials related to JDO.

An in-depth look at using Castor's marshalling engine to do data binding of Java objects to tables, rows, and columns in an SQL database.